pod install returns a warning on license file mismatch

[moxiegirl]

manthony at booboo in ~/repos/hello-blockstack/hello-blockstack-ios on master [!?]
$ pod cache clean --all

manthony at booboo in ~/repos/hello-blockstack/hello-blockstack-ios on master [!?]
$ pod install
Analyzing dependencies
Downloading dependencies
Using Blockstack (0.4.0)
Using CryptoSwift (0.13.0)
Generating Pods project
Integrating client project
Sending stats
Pod installation complete! There is 1 dependency from the Podfile and 2 total pods installed.

[!] Automatically assigning platform `ios` with version `11.2` on target `hello-blockstack-ios` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.

[!] Unable to read the license file `LICENSE` for the spec `Blockstack (0.4.0)`